# crytic/evm-opcodes

Ethereum opcodes and instruction reference

Repository: https://github.com/crytic/evm-opcodes
Canonical: https://ross.abutalabs.com/products/evm-opcodes
License: Apache-2.0
License Family: permissive
Topics: ethereum, opcodes, evm, instructions
Last push: 2024-08-19T01:36:24+00:00

## Health v2 (maintenance only)
Score: 32/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 35, longevity 100
- inputs: {"age_days": 3120, "days_push": 745, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1358, forks 217 (observed 2026-08-28T04:04:29.556114+00:00)

## What it is
A consolidated reference of Ethereum Virtual Machine (EVM) opcodes, including their hex codes, names, descriptions, and gas costs. It aggregates information from the yellow paper, client implementations, and security tooling sources.

## Use cases
- look up what an EVM opcode does
- find gas costs for Ethereum VM instructions
- reference table of EVM opcodes while writing Solidity or bytecode
- check which EIP introduced an opcode like SHL or SHR
- learn EVM instruction set for smart contract auditing

## When to choose
- you need a quick, consolidated lookup of EVM opcodes and gas costs
- you are auditing or reverse-engineering EVM bytecode
- you want a maintained reference sourced from official Ethereum documents and clients

## When to avoid
- you need programmatic access to opcode metadata in your code rather than documentation
- you need exhaustive, always-current gas costs since the gas data is a work in progress
- you need a full EVM implementation or emulator

## Facets
- artifact type: learning-resource
- maturity: stable
- function: documentation, developer-tools
- domain: blockchain, developer-tools, documentation
- platform: -
- tags: ethereum, evm, opcodes, reference, gas-costs, smart-contracts, web-server

## Member repositories
- crytic/evm-opcodes (main) score 32

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:04:29.556114+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T04:41:45.580107+00:00, confidence not recorded.
  - readme: https://github.com/crytic/evm-opcodes (fetched 2026-08-28T04:04:29.556114+00:00, sha 7c5436331b81)
- Data as of 2026-08-30T08:39:29.467469+00:00.